The Super Bowl is over, pitchers and catchers are preparing to report for Spring Training, and nearly all of the notable free agent relievers have signed. The market still includes a few names with closer experience like Joe Nathan, Bobby Parnell, and Matt Thornton. Greg Holland is out there too, but he's on the shelf for the year after undergoing Tommy John surgery late last season.
Barring a surprise trade, teams have already rostered their late innings relievers. Those trades do happen from time to time – last season the Braves traded Craig Kimbrel to the Padres despite San Diego's already strong bullpen.